It's at least conceivable that the correct valuation of a company changes from one day to the next due to human-scale events, and that speculators are providing

It's at least conceivable that the correct valuation of a company changes from one day to the next due to human-scale events, and that speculators are providing a useful pricing signal. Changes from one millisecond to the next are amplifying pure noise produced by flaws in the mechanics of trades reaching the market and clearing.